[jira] Commented: (ARIES-47) Add interceptor concept to aries blueprint.

["Andrew Osborne (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARIES-47?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797055#action_12797055 ] 

Andrew Osborne commented on ARIES-47:
-------------------------------------

Adding the asm patch via ARIES-85

> Add interceptor concept to aries blueprint.
> -------------------------------------------
>
>                 Key: ARIES-47
>                 URL: https://issues.apache.org/jira/browse/ARIES-47
>             Project: Aries
>          Issue Type: New Feature
>          Components: Blueprint
>            Reporter: Andrew Osborne
>            Assignee: Andrew Osborne
>         Attachments: asm_subclass_proxy_patch.txt
>
>
> Add support for 'interceptors' to Aries blueprint. 
> The concept is to allow interceptors to be configured for a bean, so that whenever invocations are made to methods on the bean, the interceptors are notified before the call, and after the call. 
> An interceptors intent is not to modify the arguments to the call, or the return from the call, but merely to be notified, and to be able to inspect the arguments that were passed (if any), and the response/exception returned (if any).
> Interceptor would be added as a new Interface, at the same level as BeanProcessor, and the ComponentDefinitionRegistry enhanced to allow Interceptors to be registered against BeanMetadata. 
> NamespaceHandlers will be able to add interceptors via the ParserContext when invoked to handle custom elements/attributes. 
> Interceptors would 'see' : The bean metadata for the invocation, The method being / that-was invoked, and any Arguments/Return data/Exceptions. 
> Interceptors would be implemented by dynamically creating a subclass of the bean that wrappers the original instance of the bean, replacing the bean in the blueprint container. 
> (CGlib looks interesting for the dynamic subclass, although potentially problematic regarding classes without default zero-arg constructors, if not cglib, then lower using the asm library instead)
> The dynamic subclass will coordinate invoking the interceptors, and the delegation of the call to the instance of the bean. 

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